• KAGRA
• Subgroups
• AOS
• TMSX_O3
• 2018-10-03

20181003

Today's activities

Workers: Akutsu, K. Nagano, Aritomi K. Tanaka, Kita

• Delivered an oplev pylon.
• Delivered a K400 flange (VN7877 by Mirapro), which had been washed at Mirapro.

• Checked the polarity of LVDTs and actuator coils, and compared with the one measured in Mitaka shown here.

  • When we took up the side of the table where LVDT-V1 was installed, the raw LVDT-V1 signal (VIS-TMSX_LVDTINF_**_INMON) showed negative signal; in the same manner, V2-> positive, V3-> negative, and all the horizontal signals (H1,H2,H3) were positive; they were consistent with those of in Mitaka.

  • When we input plus (about +3000 counts) signal to actuator coil H1, the raw LVDT H1, H2, and H3 (VIS-TMSX_LVDTINF_**_INMON) showed all positive; in the same manner, ActCoil H2 positive -> all LVDT-Hx positive, ActCoil H3 positive -> all LVDT-Hx positive, ActCoil V1 positive (+5000 counts) -> LVDT-V1 negative, ActCoil V2 positive -> LVDT-V2 positive, ActCoil V3 positive -> LVDT-V3 negative.

  • To translate the results of the actuator coils, considering the polarity of the raw LVDT signals, all the actuator coils were set to actuate the table to the positive directions when we input positive counts to them; the positive directions' here followed the difinitions in here; positive yaw is counter clock wise from the top view, and upward is positive vertical.

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